Grounding method Question

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Turk1957

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Existing Stamping plant basement floor slab, new press being installed... (8) 15'-O" long, 3/4" diameter ground rods being driven and then connected with exothermically welded #4/0 bare copper grounding conductors... My question is, how far below the slab do the grounding conductors have to be?
 
There is no depth requirement in the NEC for a grounding electrode conductor, but there is no requirement for any of the work you describe so I would ask the person asking for all this grounding what they want.
 
Grounding method Question

Any ideas as how to ground a large press that is sitting on an existing 6 foot thick concrete slab? Grond rods need to have at least 8 feet in contact with soil, but then how do I connect the ground rods together?
 
Turk1957 said:
Any ideas as how to ground a large press that is sitting on an existing 6 foot thick concrete slab? Grond rods need to have at least 8 feet in contact with soil, but then how do I connect the ground rods together?
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Why are you installing ground rods?
 
Turk1957,

Welcome to the forum, I have merged your two threads as it is really the same question. It gets confusing with two threads about the same subject at the same time. :)
 
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